Explore topic-wise InterviewSolutions in Current Affairs.

a. Silver is deposited in copper rod. Colour of solution changes to blue. 

b. Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2Ag 

c. 2Ag⁺ + 2e^- → 2Ag (Reduction) 

Cu → Cu²⁺ + 2e^- (Oxidation)

Na^+,

H₃O⁺

H₂O

a. Zn → Zn²⁺ + 2e^-

b. Zn + Cu²⁺ → Zn²⁺ + Cu 

c. Fe → Fe²⁺ + 2e^-

d. 2Ag²⁺ + 2e- → 2Ag

e. Pb²⁺ + 2e^- → Pb 

f. Mg + Pb²⁺ → Mg²⁺ + Pb

Answer is Reduction

Na⁺ ions. These ions accept one electron and changes to sodium atom. That is sodium ions are reduced.

Copper is connected to the positive terminal of the battery.

2Cl^- (aq) → Cl₂ (g) + 2e^-

a. i. Cu-Ag cell 

Anode: Cu (s) → Cu²⁺ (aq) + 2e^- 

Cathode: Ag⁺ (aq) + le^- → Ag(s) 

ii. Zn-Ag cell 

Anode: Zn (s) → Zn²⁺(aq) + 2e^-

Cathode: Ag⁺ (aq) + le^- → Ag (s)

(iii) Mg-Ag cell 

Anode: Mg (S) → Mg²⁺ (aq) + 2e^- 

Cathode: Ag⁺ (aq) + le^- → Ag (s) 

(iv) Zn – Cu cell 

Anode: Zn (s) → Zn²⁺  (aq) + 2e^- 

Cathode: Cu²⁺ (aq)+ 2e^- → Cu(s) 

(v) Mg-Cu cell 

Anode: Mg (s) → Mg²⁺ (aq) + 2e^- 

Cathode: Cu²⁺ (aq) + 2e^- → Cu (s)

(vi) Mg-Zn cell 

Anode: Mg (s) → Mg²⁺ (aq) + 2e^- 

Cathode: Zn²⁺ (aq) + 2e^- → Zn(s)

b.  6 cells

Answer is Three

Copper sulphate solution.

Answer is (B) Complex compound

Chlorine(Cl₂)

Answer is (A) Alkali metals

a. After some time the cut piece of sodium will turn dull. 

b. Corrosion. 

c. 4Na(s) + O₂ (g) → 2Na₂O

2Na(s) + 2H₂O(l) → 2NaOH(s) + H₂(g)

2NaOH (s) + CO₂ (g) → Na₂CO₃(s) + H₂O(l)

a. Test Tube which contains hot water. 

b. Temperature, When temperature increases the number of molecules with thresh-old energy increases. As a result number of effective collisions increases.

a. Mg > Zn > Fe > Cu

b. Zn + 2HCl → ZnCl₂ + H₂ 

Fe + 2HCl → FeCl₂ + H₂ 

Cu + HCl → No reaction 

Mg + 2HCl → Mg Cl₂ + H₂

1. Hydrogen, Oxygen.

a. Mg reacts with hot water liberating hydrogen, Copper does not react with hot water. 

b. 2Na + 2H₂O → 2NaOH + H₂ . 

c. Na > Mg > Cu.

Answer is Sodium

a. Cell 1: Anode Mg → Mg²⁺ + 2e^- 

Cathode Zn²⁺ + 2e^- → Zn 

Cell 2: Anode Zn → Zn²⁺ + 2e^- 

Cathode Ag⁺ + le^- → Ag 

b. Ag. Lesser tendency to give up electron that is it is a less reactive metal.

Cu²⁺  + 2e → Cu

a. Hydrogen. 

b. Colour changes to pink. Due to the presence of sodium hydroxide (alkaline nature).

At cathode : Ag⁺ + le^- → Ag 

At anode : Cu → Cu²⁺ + 2e^-

No. Both the test tube does not contain same quantity of foam. Distilled water taken test tube contains more foam. Soap does not lather well in hard water. The hardness of water is due to dissolved calcium and magnesium salts in it. These salts react with soap to form insoluble compounds resulting in the decrease of lather.

Detergents are more effective than soaps in hard water. Detergents are effective in acidic solutions. Demerits: excessive use of the detergents causes environmental problems. The microorganisms in water cannot decompose the components of detergents. Hence the detergents released into water lead to the destruction of aquatic life. For example, the detergents which contain phosphate increases the growth of algae and limits the quantity of oxygen. Therefore, it dej creases the quantity of oxygen for the breath of the organisms in water and causes their destruction.

a. 

b. Yes. It is possible. 

c. Substitution reactions. 

d. CuSO₄ + Mg → Cu + MgSO₄ 

CuSO₄ + Zn → ZnSO₄ + Cu 

CuSO₄ + Fe → FeSO₄  + Cu 

ZnSO₄ + Mg → MgSO₄ + Zn

AgNO₃ + Mg → Ag + MgNO₃ 

AgNO₃ + Cu → CuNO₃ + Ag 

AgNO₃ + Zn → ZnNO₃ + Ag 

AgNO₃ + Fe → FeNO₃ + Ag

Before the experiment the Zn rod was colourless. After the experiment Zn rod became blue due to the deposition of copper.

a. A – Mg,

B – Cu,

C – Ca 

b. Cu (s) + 2H₂O (l) → Cu OH₂(aq) + H₂(g)

When the Zn rod is dipped in CuSO₄ solution, the Cu²⁺ ions in the solution get deposited at the Zn rod as Cu atoms.

Zn is more reactive Zn or Cu

Oxidation. Because the losing of electrons is called oxidation.

Zn is placed above Cu in the reactivity series because Zn has a higher reactivity than Cu.

a. Chemical reaction takes place in test tube (ii) only. 

b. These chemical reactions are called displacement reactions.

c. Chemical equation: (including oxidation states) 

Mg° (s) + Fe²⁺ S⁶⁺ O4^2- (aq) → Mg²⁺S⁶⁺O^2-₄ (aq) + Fe° (s) 

At Mg : Mg°(s) → Mg²⁺ (aq) + 2e^- (oxidation) 

At Fe²⁺ , Fe²⁺ (aq) + 2e^- →  Fe°(s) (reductipn)

• Chromium plating is used in motor car etc.
• To make metal coating easily corroding metals to prevent corrosion. 
• In ICs (Integrated Circuits) coating of gold /silver is made by electroplating.

Metal which was oxidised: Cu

Metal ion which was reduced: Ag⁺

2 Ag⁺¹ NO^1-₃ + Cu°→ Cu²⁺ (NO₃)₂^-1 + 2Ag⁰

Reduction. The gaining of electrons is called reduction.

Cu^-2+ + 2e^- → Cu

The blue colour of CuSO₄ solution is due to the presence of Cu²⁺ ions. The change in intensity of the colour of CuSO₄ solution because when the Znrod is dipped in CuSO₄ solution, the Cu²⁺ ions in the solution get, deposited at the Zn rod as Cu atoms.

Cu → Cu²⁺ + 2e^-

Answer is Copper

Oxidation : Cu⁰ → Cu²⁺ + 2e^-

Reduction : Ag⁺ + le^- → Ag⁰

Answer is Oxidation.

1. Debtor 

2. Order or promise, order to make payment

3. Needs acceptance by drawee/does not need any acceptance. 

4. Three – Drawer, Drawee, Payee Two – Drawer and payee 

5. Drawer has secondary liability.

Journal Book of Santhosh

The display of the merchandise plays an important role in attracting the Customers.

Correct answer is (c) Endorsement

Correct option: b. Fixtures

Following are the essential features of a bill of exchange.

1. It must be in writing.

2. It must be an order to pay, and not a request to pay.

3. No condition should be attached to the order.

4. The drawer must sign the bill

5. The order must be for the payment of money only.

6. It should be properly stamped.

7. The amount mentioned in the bill may be made payable either on demand or after the expiry of a ‘stipulated period.

Three extra days over the nominal due date legally given to the acceptor of a bill to make payment are called days of grace. Days of grace are allowed only in the case of time bills.